<template>
  <div>
    <el-container>
      <el-header style="background: red;">header</el-header>
      <el-container>
        <el-aside style="background: yellow;">aside</el-aside>
        <el-container>
          <el-main style="background: blue;">main</el-main>
          <el-footer style="background: black;">footer</el-footer>
        </el-container>
      </el-container>
    </el-container>
  </div>
</template>